Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Earnings Per Share [Abstract]
Net Income	$ 21,583		$ 13,276		$ 62,654		$ 40,043
Earnings allocated to participating securities - nonvested restricted shares	216		109		598		355
Earnings allocated to participating securities - preferred shares	42		27		121		58
Earnings allocated to common shareholders, Basic	21,325		13,140		61,935		39,630
Weighted average common shares outstanding	52,112		50,834		51,772		47,032
Basic earnings per common share	$ 0.41		$ 0.26		$ 1.20		$ 0.84
Dilutive effect of equity awards and warrants	404		1,463		707		915
Earnings allocated to common shareholders, Diluted	$ 21,325	[1]	$ 13,142	[1]	$ 61,940	[1]	$ 39,635	[1]
Weighted average diluted common shares outstanding	52,516		52,297		52,479		47,947
Diluted earnings per common share	$ 0.41		$ 0.25		$ 1.18		$ 0.83
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	58		138		67		99

[1] Earnings allocated to common shareholders for basic and diluted EPS may differ under the two-class method as a result of adding common stock equivalents for options and warrants to dilutive shares outstanding, which alters the ratio used to allocate earnings to common shareholders and participating securities for the purposes of calculating diluted EPS.